Is this a good way to respond to my friend?

My friend and I are having a debate about whether or not it's a good idea to redshirt(delay Kindergarten entrance by a year) kids with summer and fall birthdays. He's for it, and I'm against. His reasoning is this:

"If you don't redshirt them, they'll have to wait until after their junior year of college to drink."

At the time, I was so shocked I didn't know how to respond. However, I have now been able to come with a typed response which I feel is quite reasonable and accurate:


I don't think there's a problem with red-shirting, but it should only be done if your kid truly isn't ready for Kindergarten. On another forum, this user said something like:

"If you don't redshirt your kid, they won't be able to drink until after their junior year of college."

My response:

"WTF?! That's one of the most absurd reasons I've ever heard. We're supposed to be making decisions about a 4-year-old based on something 16 years in the future? Besides, that's not even necessarily a true statement. How do you even know they'll want to go college? College isn't for everyone. Besides, even if they do go to college, there's no guarantee that they'll graduate in 4 years. That's another assumption you're making. In fact, according to these websites, most people don't graduate in 4 years.

http://www.nytimes.com/2014/12/02/education/most-c...-4-years-study-finds.html?_r=0

http://www.politifact.com/wisconsin/statements/201...e-takes-six-years-us-sen-ron-/

http://business.time.com/2013/01/10/the-myth-of-the-4-year-college-degree/

So, it's very likely that they will still turn 21 before their junior year."

What do you think? Is this a good response? IMHO, redshirting for post-high school reasons borders absurdity, because you really can't predict their future after high school. You can send a child to Kindergarten at 4 and safely assume that they will not turn 17 until their senior year of high school, but you cannot assume that they will not turn 21 until their senior year of college.

I'm also backing up my statements with sources, which he didn't do. Thanks!